I assume it was an extract/partial boil since you are a new member. Often sugars don't mix well, and taking a sample from the top will give you a lower reading than you actually have. Do some research and you will find it a common issue.
Don't worry, the yeast will find the sugars.
If it was an extract batch, you will have your target OG.
Post your ingredients, and volume, and someone can tell you if yu need be concerned or not. Extract has a know amount of sugar, so it is easy to estimate actual gravity without a measurement.
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